Mechanical Assessment of Maglev Vehicle: A Proposal for Implementing Maglev Trains in Iran

2010 ◽  
Author(s):  
Hamid Yaghoubi ◽  
M. Sadat Hoseini
Keyword(s):  
High Speed ◽  
Magnetic Levitation ◽  
Rapid Development ◽  
Suspension System ◽  
Magnetic Suspension ◽  
Response Characteristics ◽  
Suspension Systems ◽  
Maglev Vehicle ◽  
High Speed Trains ◽  
Live Loads

Rapid development of transportation industries worldwide, including railways and the never ending demand to shorten travel time during trade, leisure, etc. have caused planning and implementation of high-speed railways in many countries. Variety of such systems including magnetic levitation (maglev) has been introduced to the industry. Contrary to traditional railway vehicles, there is no direct contact between maglev vehicle and its guideway. These vehicles travel along magnetic fields that are established between the vehicle and its guideway. Therefore, these vehicles can travel at very high speeds. The replacement of mechanical components by electronics components overcomes restrictions of conventional railway. Manned maglev vehicles have recorded speed of travel equal to 581km/hr. This has practically paved the way to manufacture super high-speed trains. Currently, there are ElectroMagnetic Suspension (EMS) and ElectroDynamic Suspension (EDS) systems available to the industry. There are also varieties of vehicles that are manufactured based on these two types of systems. Mechanical engineering plays vital roles in design and analysis of suspension systems and corresponding vehicles. In this research, different types of maglev suspension systems and vehicles are studies. It is the purpose of this research to design a model for magnetic suspension system and a model for maglev vehicle. Static and dynamic live loads due to the maglev vehicle are investigated and mathematical model of maglev loading is presented. The proposed model for maglev vehicle is thoroughly analyzed for its static and dynamic loading. This study is focused on the dynamics of maglev vehicle. Modeling vehicle/guideway interactions and then explain the response characteristics of the maglev system for a five-car vehicle traveling on a single-span guideway, with emphasis on vehicle/guideway coupling effects are accomplished. Design of maglev vehicle with finite element method is also considered. Results justify practicality of the proposed suspension system and vehicle for Tehran-Mashhad maglev project.

scholarly journals Levitation Methods for Use in the Hyperloop High-Speed Transportation System

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4190 ◽  
Author(s):  
Eric Chaidez ◽  
Shankar P. Bhattacharyya ◽  
Adonios N. Karpetis
Keyword(s):  
Speed Of Sound ◽  
High Speed ◽  
System Size ◽  
Magnetic Suspension ◽  
Air Bearings ◽  
Commercial Aviation ◽  
Simple Theories ◽  
Suspension Systems ◽  
Air Resistance ◽  
High Speed Trains

The Hyperloop system offers the promise of transportation over distances of 1000 km or more, at speeds approaching the speed of sound, without the complexity and cost of high-speed trains or commercial aviation. Two crucial technological issues must be addressed before a practical system can become operational: air resistance, and contact/levitation friction must both be minimized in order to minimize power requirements and system size. The present work addresses the second issue by estimating the power requirements for each of the three major modes of Hyperloop operation: rolling wheels, sliding air bearings, and levitating magnetic suspension systems. The salient features of each approach are examined using simple theories and a comparison is made of power consumption necessary in each case.

A measurement method for the overturning coefficient of high-speed trains passing through complex terrain sections under strong wind conditions

2019 ◽  
Vol 234 (8) ◽  
pp. 885-895
Author(s):  
Zhaijun Lu ◽  
Weijia Huang ◽  
Mu Zhong ◽  
Dongrun Liu ◽  
Tian Li ◽  
...  
Keyword(s):  
Real Time ◽  
Complex Terrain ◽  
High Speed ◽  
Suspension System ◽  
Strong Wind ◽  
Real Time Monitoring ◽  
Monitoring Method ◽  
High Speed Trains ◽  
Strong Winds ◽  
Pass Through

Real-time monitoring of overturning coefficients is very important for ensuring the safety of high-speed trains passing through complex terrain sections under strong wind conditions. In recent years, the phenomenon of “car swaying” that occurs when trains pass through the complex terrain has brought new challenges to ensuring the safety and riding comfort of passengers. In China, more and more high-speed trains are facing strong wind environments when running in complex terrain sections. However, due to the limitation of objective conditions, so far, only a few economical and effective methods of measurement have been developed that are suitable for real-time monitoring of the overturning coefficient of commercial vehicles. Therefore, considering the applicability and universality of such a monitoring method, this study presents a method for measuring the overturning coefficient of trains using the primary suspension system under strong winds. A vehicle test was carried out to verify the accuracy of the method. The results show that after correction, the overturning coefficient obtained from the primary suspension system is generally consistent with the overturning coefficient obtained from the instrumented wheelset. The method of measuring the overturning coefficient of trains in strong wind environments with the primary suspension system is, thus, proven feasible.

The Vibration Response Analysis about High-Speed Train’s Braking Wing

2012 ◽  
Vol 226-228 ◽  
pp. 102-105
Author(s):  
Wen Qing Zhu ◽  
Yang Yong Zhu
Keyword(s):  
Finite Element ◽  
High Speed ◽  
Rapid Development ◽  
Response Analysis ◽  
High Speed Train ◽  
High Speed Railway ◽  
Emergency Braking ◽  
Finite Element Software ◽  
High Speed Trains ◽  
Aerodynamic Brake

With the rapid development of high-speed railway in China, the aerodynamic brake is very likely to be an important emergency braking mode of high-speed train in the future. This paper takes aerodynamic braking wing as the object, and uses the finite element software to divide the meshes, then analyses the model influenced by static stress. After simulating the vibratory frequency response of the model in the flow field, it finds that the largest deformation happens in the middle of the upper edge of the wind wing, when the wind speed gets to 500km/h and the load frequency to 4Hz. Some conclusions of this thesis can provide reference for researching the applying the aerodynamic brake in the high-speed trains and laying the foundation for solving the riding and braking safety problems.

scholarly journals Selection of the characteristics of the suspension system of the high-speed tracked robot

2021 ◽  
Vol 1 (2) ◽  
pp. 63-70
Author(s):  
YE.B. Sarach ◽  
◽  
YA.A. Tkachev ◽  
M.E. Krokhin ◽  
◽  
...  
Keyword(s):  
High Speed ◽  
Natural Frequencies ◽  
Resonant Mode ◽  
Suspension System ◽  
The Body ◽  
Suspension Systems ◽  
A Value ◽  
Dirt Road ◽  
Suspension Stiffness ◽  
Selection Of

Currently, the field of mechanical engineering is rapidly developing, including the creation of robotic high-speed vehicles. The design of suspension systems for such vehicles must be accompa-nied by the fulfillment of certain requirements, which are currently not formulated. Considering the thing that there is no person in the body of a high-speed robot, the application of the requirements for the suspensions of crew vehicles is not justified. In order to develop recommendations on the choice of characteristics of suspension systems for high-speed tracked robots, the research objects, which mass is in the range from 1000 to 10000 kg are determined. No suspension system is required for objects weighing less than 1000 kg. Objects weighing more than 10,000 kg will be created on the basis of existing serial vehicles. The study is based on the provision that the considered class of vehicles is not subject to re-strictions on the range of natural frequencies of body vibrations. Considering that one of the main requirements remains for high-speed tracked robots - ensuring a high average speed, it is proposed to increase the suspension stiffness in order to exclude resonance from the range of possible travel speeds. Using the accepted provisions, a study of the suspension system of increased stiffness is carried out. The movement along the tracks of a harmonic profile in resonance mode and a broken dirt road is simulated. The results of the study show that the characteristics of the suspension system, selected accord-ing to the proposed method, make it possible to move along the line of the harmonic profile in the resonant mode without suspension breakdowns. The speed of movement on a broken dirt road is limited to a value, which exceeding leads to sig-nificant vibrations of the body and an increase in the load on the elements of the suspension system. The absence of breakdowns leads to a decrease in the loading of the suspension, which makes it possible to reduce the mass of its elements.

Research on Model of Noise Prediction of High-Speed Train by SEA Method

2012 ◽  
Author(s):  
Lifang Yang ◽  
Xiaowei He ◽  
Fanyu Meng
Keyword(s):  
High Speed ◽  
Rapid Development ◽  
Noise Analysis ◽  
Input Power ◽  
Aerodynamic Noise ◽  
Noise Prediction ◽  
High Speed Train ◽  
Small Noise ◽  
High Speed Trains ◽  
Calculation Results

China’s rapid development of high-speed train has been in the research spotlight over the years; this paper presents a method to predict the transmission of aerodynamic noise and rail noise inside train compartments for high-speed trains operating at speeds larger than 200 km/h. The numerical tool could be used in parameter studies for noise control. In order to develop the noise prediction model of high speed train, the noise source of high-speed train is analyzed. Based on the noise analysis, the SEA model is built. Due to the small noise difference in one train car, the SEA model is divided into head cab, head passenger cab and middle car three parts. Combined with the finite and boundary element method, the input power and SEA parameters are researched and calculated. In the end of the paper, the results of SEA noise predicting model are compared with theoretical calculation results in order to verify the engineering use.

An Active Repetitive Learning Control Method for Lateral Suspension Systems of High-Speed Trains

2020 ◽  
Vol 31 (10) ◽  
pp. 4094-4103 ◽  
Author(s):  
Deqing Huang ◽  
Chunrong Chen ◽  
Tengfei Huang ◽  
Duo Zhao ◽  
Qichao Tang
Keyword(s):  
High Speed ◽  
Control Method ◽  
Learning Control ◽  
Suspension Systems ◽  
High Speed Trains ◽  
Repetitive Learning

Dynamic Interactions Between Long, High Speed Trains of Air Cushion Vehicles and Their Guideways

1971 ◽  
Vol 93 (1) ◽  
pp. 16-24 ◽  
Author(s):  
James F. Wilson ◽  
Sherrill B. Biggers
Keyword(s):  
High Speed ◽  
Span Length ◽  
Static Deflection ◽  
Dynamic Interactions ◽  
Suspension Systems ◽  
Passenger Safety ◽  
High Speed Trains ◽  
Air Cushion ◽  
Vertical Accelerations ◽  
Air Cushion Vehicles

Trains of high speed air cushion vehicles traversing simple spans are modeled as uniform pressure segments traveling at arbitrary speeds over identical Bernoulli-Euler beams. Series solutions are found for the transient span and vehicle responses where the trains overlap several spans at a time. Elastic foundation, span tension, and span damping effects are included. Conclusions reached after studying some realistic numerical examples for constant-speed trains on elevated spans are: (a) for trains which are longer than one span length, the dynamic deflection factors (maximum ratios of dynamic to static deflection at midspan) approach 2.0 at speeds between 300 and 600 mph, and occur as the end of the train approaches, midspan; (b) these dynamic deflections may be reduced by the addition of damping, by a reduction of span length, by the addition of span tension, and by an increase in span stiffness; (c) the high vertical accelerations of the vehicles, which may approach 2 g’s at speeds of 300 mph, show the need for advanced suspension systems to insure passenger safety and comfort.

Ride Quality of High-Speed Trains Traveling Over the Corrugated Rails

2006 ◽  
Author(s):  
H. Farahpour ◽  
D. Younesian ◽  
E. Esmailzadeh
Keyword(s):  
High Speed ◽  
Ride Comfort ◽  
The Body ◽  
Ride Quality ◽  
Comfort Index ◽  
Suspension Systems ◽  
Power Spectral ◽  
High Speed Trains ◽  
Train Speed ◽  
Secondary Suspension

Ride comfort of high-speed trains is studied using Sperling's comfort index. Dynamic model is developed in the frequency domain and the power spectral density (PSD) of the body acceleration is obtained for four classes of tracks. The obtained acceleration PSD is then filtered using Sperling's filter. The effects of the rail roughness and train speed on the comfort indicators are investigated. A parametric study is also carried out to evaluate the effects of the primary and secondary suspension systems on the comfort indicators.

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